This was the iridium layer. Here on the bank of the Brazos, I was holding microscopic pieces of the asteroid that killed the dinosaurs– fragments from the event that gave mammals a chance to ...

The team suggested a supernova may have stripped the ozone layer ... for the dinosaur extinction when (the) idea was first published in 1980. The supernova idea needs its iridium equivalent ...

dooming the dinosaurs and many other species to extinction.Researchers first identified the cause of the end-Cretaceous extinction by the discovery of the “iridium anomaly” — a 1-centimeter-thick (0.4 ...